Xiaomi laptops have gained popularity through a combination of performance, design and affordable price. However, when buying a used device or checking a warranty, the question often arises: how to accurately determine the year of release? This information is critical to assessing the residual battery life, the relevance of drivers and even market value. Unlike smartphones, where the date of production can be found through IMEI, laptops have a different algorithm.
In this article, we will discuss 5 working methods, from serial number analysis to hidden BIOS menus, that will help calculate the age of your Mi Notebook, RedmiBook or Xiaomi Book. We will focus on the nuances: why data on the box and in the system can diverge, how to recognize a fake by date, and what to do if the serial number is erased. All instructions are illustrated with real examples for models from 2018-2026.
Serial number: main key to the release date
The serial number (S/N) is a unique laptop identifier that encodes model, batch and production date information. Xiaomi has a standardized S/N format: the first 4-6 characters often contain a coded year and week of release. For example, in the number LN721A12345678, the LN721 combination can mean the 21st week of 2017 (where 7 is the last digit of the year, 21 is the week).
Where to find the serial number:
- 📋 On the sticker under the battery (requires to disconnect the lower cover).
- 💻 V BIOS/UFEI (pinch F2 or Del at boot).
- 🖥️ In Windows: Start → Parameters → System system → About the system (section "Characteristics of the device").
- 📦 On a box (if saved) - usually on a barcode sticker.
⚠️ Warning: On fake laptops, serial numbers are often duplicated or do not match Xiaomi's format. mi.com/verify — If the system doesn't recognize it, it's a cause for suspicion.
Transcription of the serial number for popular series:
| Model | S/N format | Example | Transcription |
|---|---|---|---|
| Mi Notebook Pro (2021) | XM2106XXXXXXX | XM2106A123456 | 21 years, 6 weeks (February 2021) |
| RedmiBook 14 (2020) | RB2035XXXXXXX | RB2035B789012 | 20 year, 35 week (August 2020) |
| Xiaomi Book S 12.4 (2022) | XBS2212XXXXXXX | XBS2212C345678 | 22 years, 12 weeks (March 2022) |
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If the serial number starts with the letters LN, XM or RB, it is guaranteed to be the original Xiaomi laptop.Fakes often use random combinations like SN123456789 or CHINA-XXXXX.
2. Check through BIOS/UFEI: hidden-data
The BIOS menu contains technical information that can't be faked software.
- Turn off the laptop.
- Press the F2 key (for most Xiaomi models) or Del.
- Turn on the power without releasing the key until the blue BIOS screen appears.
In the Main or System Information section, look for the fields:
- 📅 Manufacture Date – Exact build date (example: 03/15/2023).
- 🔢 Serial Number – duplicates the sticker, but sometimes contains extended data.
- 🖥️ Product Name: A laptop model (e.g. Mi Notebook Air 13.3").
What to do if the BIOS asks for a password?
On Xiaomi Book Pro 2022+ models, the production date may be hidden in the Advanced → System Component Information section. If the menu is in Chinese, look for the characters (production date) or (serial number).
3. Analysis of the box and documents: where to look for the date
Xiaomi’s original packaging contains several locations where the date of production or first sale is listed:
- 📦 Sticker on the end of the box with a barcode - look for a line MFD (Manufactured Date) or DATE. Format: YYYY-MM-DD or YY/MM.
- 📄 Warranty card – the date of commencement of the warranty usually coincides with the date of sale (but not production!).
- 🏷️ Sticker on the laptop itself (under the battery) – can duplicate data from the box.
An important nuance: the date on the box may differ from the actual date of production by 1-3 months, and this is related to logistics - laptops often lie in warehouses before being shipped to stores. For example, if the box says 2023-05-10, and the BIOS says 03/20/2023, this is normal.
⚠️ Note: Fake boxes often have dates printed blurry or do not conform to Xiaomi standard.The original packaging is clear font, hologram and QR-code that leads to the official website.
☑️ Checking the box for authenticity
4. Software methods: utilities for determining age
If physical access to a laptop is limited (like buying online), you can use specialized utilities that analyze chipset, battery, and firmware data to determine the approximate age.
Top.-3 Windows:
- HWiNFO (free): Download from the official website. Launch, go to the Motherboard section. Find the BIOS Date field, which is the BIOS firmware date, which is usually close to the production date.
- Speccy (from Piriform): In the Summary section, look for System Manufacturer and System Model. For the production date, see BIOS → Version.
Command Prompt
wmic bios get releasedateThis team will put a release date BIOS format YYYYMMDD000000.000000+000.
For macOS/Linux, the dmidecode utility (requires root launch) is suitable:
sudo dmidecode -t bios | grep"Release Date"💡
Programs show the firmware date of the BIOS, not the laptop, and the difference between these dates is usually 1-2 months, but for accuracy check the data with the serial number.
Assessment of battery status: indirect method
If other methods are not available, the age of the laptop can be estimated by the wear of the battery. Xiaomi batteries lose capacity predictably: ~10-15% per year when used actively.
- Open the Command Prompt on behalf of the administrator.
- Enter powercfg /batteryreport /output"C:\battery_report.html"
- Open the file. battery_report.html browser-wise.
- Find the Battery Capacity History section, where the current and initial capacity are listed.
Example of calculation:
- Initial capacity: 50,000 mAh.
- Current capacity: 37,500 mAh.
- Wear: (50 000 – 37 500) / 50,000 × 100% = 25%.
- Approximate age: 25% / 12% (average wear per year) ≈ 2 years.
⚠️ Note: This method only works for original batteries. If the battery was replaced, the data will be incorrect. Check the battery model in Device Manager - it should start with Xiaomi or LD (for example, LD03L5L For RedmiBook 14).
6. Online services: Checking the Xiaomi database
Xiaomi provides two official authentication and production date tools:
- Verification service (mi.com/verify): Enter the serial number and code from the image. The system will show the model, activation date and warranty status. Restriction: only works for devices sold through official channels.
- Mi Account: If the laptop is linked to a Xiaomi account, the first activation date is displayed in Settings → Mi Account → Devices. This date may be 1-6 months later than the production date (storage time in stock).
Third-party services like SNDeepInfo also analyze serial numbers, but their data is not always accurate for Xiaomi.
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If you bought your laptop on AliExpress or from an unofficial store, there may be no date in the verification service, in which case, ask the seller for photos of the serial number stickers and boxes - this is the only way to check the age.